accountcontroller.java

java2高级教程大学教程的配套光盘源码

// AccountController.java
// AccountController is a controller for Accounts. It provides
// a JTextField for inputting a deposit or withdrawal amount
// and JButtons for depositing or withdrawing funds.
package com.deitel.advjhtp1.mvc.account;

// Java core packages
import java.awt.*;
import java.awt.event.*;

// Java extension packages
import javax.swing.*;

public class AccountController extends JPanel {
   
   // Account to control
   private Account account;   
   
   // JTextField for deposit or withdrawal amount
   private JTextField amountTextField;
   
   // AccountController constructor
   public AccountController( Account controlledAccount ) 
   {
      super();
      
      // account to control
      account = controlledAccount;     
      
      // create JTextField for entering amount
      amountTextField = new JTextField( 10 );
      
      // create JButton for deposits
      JButton depositButton = new JButton( "Deposit" );
      
      depositButton.addActionListener(
         new ActionListener() {
            
            public void actionPerformed( ActionEvent event )
            {
               try {

                  // deposit amount entered in amountTextField
                  account.deposit( Double.parseDouble( 
                     amountTextField.getText() ) );
               }
               
               catch ( NumberFormatException exception ) {
                  JOptionPane.showMessageDialog ( 
                     AccountController.this, 
                     "Please enter a valid amount", "Error", 
                     JOptionPane.ERROR_MESSAGE );  
               }
            } // end method actionPerformed
         }
      );
      
      // create JButton for withdrawals
      JButton withdrawButton = new JButton( "Withdraw" );
      
      withdrawButton.addActionListener(
         new ActionListener() {
            
            public void actionPerformed( ActionEvent event )
            {
               try {

                  // withdraw amount entered in amountTextField
                  account.withdraw( Double.parseDouble( 
                     amountTextField.getText() ) );
               }
               
               catch ( NumberFormatException exception ) {
                  JOptionPane.showMessageDialog ( 
                     AccountController.this, 
                     "Please enter a valid amount", "Error", 
                     JOptionPane.ERROR_MESSAGE ); 
               }               
            } // end method actionPerformed
         }
      );     
      
      // lay out controller components
      setLayout( new FlowLayout() );
      add( new JLabel( "Amount: " ) );
      add( amountTextField );
      add( depositButton );
      add( withdrawButton );
   }
}

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